WO2015142990A1 - Encryped optical markers for security applications - Google Patents

Encryped optical markers for security applications Download PDF

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Publication number
WO2015142990A1
WO2015142990A1 PCT/US2015/021165 US2015021165W WO2015142990A1 WO 2015142990 A1 WO2015142990 A1 WO 2015142990A1 US 2015021165 W US2015021165 W US 2015021165W WO 2015142990 A1 WO2015142990 A1 WO 2015142990A1
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WO
WIPO (PCT)
Prior art keywords
fluorophore
pro
developer
item
marker
Prior art date
Application number
PCT/US2015/021165
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English (en)
French (fr)
Inventor
Maciej B. SZCZEPANIK
MingHwa Benjamin LIANG
Original Assignee
Apdn (B.V.I.) Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Apdn (B.V.I.) Inc. filed Critical Apdn (B.V.I.) Inc.
Priority to JP2017501090A priority Critical patent/JP2017512692A/ja
Priority to CA2940655A priority patent/CA2940655C/en
Priority to CN201580014368.6A priority patent/CN106103121B/zh
Priority to EP15765671.1A priority patent/EP3119610B1/de
Publication of WO2015142990A1 publication Critical patent/WO2015142990A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/142—Security printing using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4825—Pressure sensitive adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/14—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using chemical means

Definitions

  • Fluorescent markers are useful as identification and security markers, but the advantage of their being readily visualized by irradiating with light of the appropriate excitation wavelength is also a disadvantage in that the fluorescent marker can be easily detected, analyzed and copied, rendering them subject to counterfeiting.
  • the present invention provides encrypted markers that are not readily detectable, but can be revealed by treatment with a specific reagent used as a developer to reveal a readily detectable physical property of the marker, such as, for instance a characteristic fluorescence emission after excitation with a particular excitation wavelength, or to reveal a visible color.
  • the encrypted marker can be developed in situ, or a sample can be removed by brushing, scraping, or scratching the marked object or item and developing the encrypted marker or a sample thereof with the appropriate developer to reveal an overt marker or optical signal.
  • the marker can be revealed by exposure of the encrypted marker in situ or a sample thereof to the developer in solution, a spray, a vapor or a solid, such as for example, a powder or granules that include the developer.
  • the encrypted marker molecules may be transferred from the marked object or item by simply swiping with a swab carrying the developer, e.g. a swab soaked in a solution of the developer or a swab on which the developer is bound or covalently immobilized.
  • the transferred encrypted marker molecules are then developed on or in the swab, or on the marked object or item.
  • the swab, or the marked object or item can be readily inspected for the presence of the revealed optical characteristics, such as color or fluorescence with emission at a specific wavelength after excitation with the appropriate wavelength of light.
  • the developer can be a chemically reactive developer that reacts with the marker to produce a detectable marker product, or the developer can be a chelating agent or other binding agent that in combination with the marker produces a detectable marker product.
  • the developer can be an ion, such as for instance, a metal ion that is bound by the marker to produce a detectable marker product.
  • the marker of the present invention is an "encrypted fluorophore" (also referred to herein as a "pro-fluorophore”) and does not have the properties of a fluorophore and is thus difficult to recognize as a security marker, but on development or reaction with a developer, which is a specific reagent suitable for development of the pro-fluorophore, is transformed into a fluorophore with a readily detectable signal. Additionally, encryption often improves the physical and chemical stability of the pro-fluorophore.
  • the chromogenic markers also referred to herein as
  • chromogens or “pro-chromophores” of the present invention are “encrypted chromophores” and are colorless or almost colorless, and are thus difficult to recognize as security markers, but on development or reaction with a developer, a specific reagent, are transformed into a readily detectable chromophore.
  • the chromophores of the invention are made visible to the naked eye after development of the respective chromogenic markers with the developer reagent specific to the chromogenic marker.
  • the markers of the present invention combine the features of both encrypted fluorophores and encrypted chromophores, wherein the encrypted fluorophores are non-fluorescent or essentially non-fluorescent and the encrypted chromophores are colorless or essentially colorless, making them difficult to detect or recognize as security markers.
  • these encrypted markers are transformed into a readily detectable fluorophore and a readily detectable chromophore.
  • such a combination marker can be simultaneously interrogated for fluorescence with UV light of an appropriate excitation wavelength, as well as for color visible to the naked eye by visual inspection of the illuminated marker after development with an appropriate developer.
  • the inventive concept provides a method for cryptically marking an item, wherein the method includes: providing a chromogenic compound as a marker capable of producing a chromophore upon reaction with a developer, and (i) coating the item with a coating comprising the chromogenic marker compound; (ii) attaching a label or indicia comprising the chromogenic marker compound to the item; or (iii) embedding the chromogenic marker compound in at least a portion of the item; and thereby providing a cryptically marked item.
  • the inventive concept provides a method for cryptically marking an item, wherein the method includes: providing a pro-fluorophore (also referred to as a cryptic fluorophore) capable of producing a fluorescent compound upon reaction with a developer, and (i) coating the item with a coating comprising the pro-fluorophore; (ii) attaching a label or indicia comprising the pro-fluorophore to the item; or (iii) embedding the pro-fluorophore in at least a portion of the item; and thereby providing a cryptically marked item.
  • a pro-fluorophore also referred to as a cryptic fluorophore
  • a pro-fluorophore or chromogenic compound is used as a marker on an object to be tracked or authenticated.
  • the marker may be painted, printed, sprayed, bonded, affixed to or embedded in or on the object or item of interest.
  • the item of interest may be swiped, rubbed or treated with a swab soaked in a solution of a developer, which is a specific reagent, capable of transforming the encrypted fluorophore marker or chromogenic marker compound into a fluorophore or chromophore, respectively, with a readily detectable signal.
  • a developer which is a specific reagent, capable of transforming the encrypted fluorophore marker or chromogenic marker compound into a fluorophore or chromophore, respectively, with a readily detectable signal.
  • the developer may be immobilized on the swab, e.g. by adsorption or by covalent bonding.
  • the item of interest may be directly exposed to the developer in the form of a vapor, a spray or a solution.
  • the development of the and authentication of the encrypted fluorophore marker or chromogenic marker compound can be performed by any suitable method, such as for instance and without limitation, in a single step wherein the encrypted fluorophore marker or chromogenic marker compound is developed directly in situ in or on the marked object, or in a two step procedure, wherein the marker is first transferred to a sampling device or swab etc., and then treated with an appropriate developer delivered in the form of a vapor, a spray or a solution, or by sprinkling the sampling device or swab etc. with a powder or granules consisting of or containing the developer.
  • Alkyl refers to a saturated branched or straight chain monovalent hydrocarbon radical of a specified number of carbon atoms.
  • alkyl includes, but is not limited to, methyl (Q alkyl), ethyl (C 2 alkyl), propyl (C 3 alkyl), isopropyl (also C 3 alkyl), n- butyl(C 4 alkyl), isobutyl (also C 4 alkyl), sec-butyl (also C 4 alkyl), and t-butyl (also C 4 alkyl).
  • Alkenyl refers to branched or straight chain hydrocarbon radical having at least one double bond between two carbon atoms.
  • Alkynyl refers to branched or straight chain hydrocarbon radical having at least one triple bond between two carbon atoms.
  • Cycloalkyl as used herein means a saturated monocyclic, polycyclic or bridged hydrocarbon ring system substituent or linking group.
  • the substituent is bonded to ring carbon atom replacing a hydrogen atom.
  • C3-C10 cycloalkyl designates a ring of three to ten carbon atoms, or a ring of three or more carbon atoms wherein the remaining carbon atoms forming one or more alkyl substituents of the ring.
  • Heterocyclyl as used herein means a saturated, partially unsaturated or unsaturated monocyclic, polycyclic or bridged hydrocarbon ring system substituent or linking group, wherein at least one ring carbon atom has been replaced with a heteroatom such as, but not limited to nitrogen, oxygen, sulfur, selenium, boron or phosphorus.
  • a heterocyclyl ring system can be a ring system having one, two, three or four nitrogen ring atoms, or a ring system having zero, one, two or three nitrogen ring atoms and one oxygen or sulfur ring atom.
  • the heterocyclic ring system can include more than one ring heteroatom.
  • a heterocyclyl substituent is derived by the removal of one hydrogen atom from a single carbon or nitrogen ring atom.
  • Heterocyclyl includes, but is not limited to, furyl, thienyl, 2H-pyrrole, 2-pyrrolinyl, 3-pyrrolinyl, pyrrolidinyl, pyrrolyl, 1,3-dioxolanyl, oxazolyl, thiazolyl, imidazolyl, 2-imidazolinyl, imidazolidinyl, 2- pyrazolinyl, pyrazolidinyl, pyrazolyl, isoxazolyl, isothiazolyl, oxadiazolyl, triazolyl, thiadiazolyl, tetrazolyl, 2H-pyranyl, 4H-pyranyl, pyridinyl, piperidinyl, 1,4-dioxanyl, morpholinyl, 1,4— dithianyl,
  • heterocyclyl also includes aromatic heterocycles, such as pyrrolyl, pyrazolyl, imidazolyl, triazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, furyl, thienyl, pyridyl, pyrazinyl, pyrimidinyl, and can be optionally substituted, for instance with alkyl.
  • aromatic heterocycles such as pyrrolyl, pyrazolyl, imidazolyl, triazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, furyl, thienyl, pyridyl, pyrazinyl, pyrimidinyl, and can be optionally substituted, for instance with alkyl.
  • Heterocyclyl also includes bicyclic heterocyclyls with one or both rings having a heteroatom, e.g. imidazopyrazinyl, benzofuranyl, benzodioxolyl, benzothiophenyl, and quinolinyl.
  • Arylalkyl means an aryl group attached to the end carbon atom of an alkyl group such as, for instance C1-C4 alkyl.
  • Aryl means an aromatic, unsaturated ⁇ -electron conjugated monocyclic or polycyclic hydrocarbon ring system substituent or linking group of six, eight, ten or fourteen carbon atoms.
  • An aryl group is derived by the removal of one hydrogen atom from a carbon ring atom.
  • Aryl includes, but is not limited to, phenyl, naphthalenyl, azulenyl and anthracenyl.
  • Halo- means fluoro (-F), chloro (-C1), bromo (-Br) or iodo (-1).
  • Carboxyl means a substituent of the formula -COOH.
  • Hydroxyl means a substituent of the formula - OH.
  • Nitro means a substituent of the formula -N0 2 .
  • Amino means a substituent of formula -NH 2 or a linking group having the formula -NH-.
  • Alkylamino or dialkylamino means a substituent of the formula -NH-alkyl or -N(alkyl) 2 , respectively.
  • pro-fluorophores or chromogenic compounds include pro-fluorophore forms of xanthane dyes such as rhodamines, rhodols and fluoresceins, as well as derivatives of coumarin, cyanine and oxazine.
  • Scheme I shows the general case of a profluorophore (Pro-FL) also interchangebly referred to herein as a fluorogenic compound, treated with a developer to produce a fluorescent compound (FL*) having a characteristic emission wavelength when stimulated with light of the appropriate excitation wavelength, wherein the emitted light is readily detectable either by eye or by spectroscopic measurement.
  • Pro-FL profluorophore
  • FL* fluorescent compound
  • Scheme II shows the general case of a chromogenic compound (CHR-gen) also interchangebly referred to herein as a leuco-form of a chromophore (i.e. a chromogen) treated with a developer to produce a chromophore or dye (CHR*) having a characteristic absorption that is readily detectable either by eye or by spectroscopic measurement.
  • CHR-gen chromogenic compound
  • CHR-gen also interchangebly referred to herein as a leuco-form of a chromophore (i.e. a chromogen) treated with a developer to produce a chromophore or dye (CHR*) having a characteristic absorption that is readily detectable either by eye or by spectroscopic measurement.
  • fluorescein derivatives useful in the practice of the present invention as marker pro-fluorophores or chromogenic compounds are derivatives of each of the following compounds: Fluorescein, 5-(and-6-)-Carboxyfluorescein (FAM), 5-(and-6)-4,7,2',7'- Tetrachlorofluorescein (TET), 5-(and-6)-2',4',4 ,5', 7 ',7-hexachloro fluorescein (HEX), 5-(and- 6)-Carboxy-4',5'-Dichloro-2',7'-Dimethoxyfluorescein (JOE), Eosin Y (2',4',5',7'- Tetrabromofluorescein), Eosin B (4',5'-Dibromo-2',7'-dinitrofluorescein), Rose Bengal (4,5,6,7- Tetrachloro-2',4',5',7'-tetraiodo
  • rhodamines useful as marker pro-fluorophores or chromogenic compounds include for instance: derivatives of Tetramethylrhodamine (TRITC), 5-(and-6)- Carboxytetramethylrhodamine (TAMRA), 5-(and-6)-carboxy-X-rhodamine (ROX), Rhodamine 110 (Xanthylium, 3,6-diamino-9-(2-carboxyphenyl)-, salts), Rhodamine B, Rhodamine 6G, etc.
  • TRITC Tetramethylrhodamine
  • TAMRA Carboxytetramethylrhodamine
  • ROX 5-(and-6)-carboxy-X-rhodamine
  • Rhodamine 110 Xanthylium, 3,6-diamino-9-(2-carboxyphenyl)-, salts
  • Rhodamine B Rhodamine 6G, etc.
  • oxazines useful as marker pro-fluorophores or chromogenic compounds include derivatives of: Nile Red, Nile Blue, Cresyl Violet and Oxazine 170, etc., which can be treated with a developer to reveal the underivatized Nile Red, Nile Blue, Cresyl Violet or Oxazine 170 marker.
  • the pro-fluorophore can be a xanthane, such instance:
  • R l 5 R 2 , R3, R4, R5, R 6 , R7, Rs, R9 and R 10 are each independently selected from hydrogen, halogen (F, CI, Br, I), nitro (N0 2 ), cyano (CN), carbonyl (CHO or C(O)R), Ci-C 8 alkyl, aryl, and C3-C8 cycloalkyl, each optionally substituted with one or more functional groups such as carboxyl, carbonyl, amino, cyano, nitro, alkyl, alkenyl, alkynyl or azido.
  • R l 5 R 2 , R3, R4, R5, R 6 , R7, Rs, R9 and R 10 are each independently selected from hydrogen, halogen (F, CI, Br, I), nitro (N0 2 ), cyano (CN), carbonyl (CHO or C(O)R), Ci-C 8 alkyl, aryl, and C3-C8 cycloalkyl, each optionally substituted
  • a pair of R groups independently selected from Ri, R 2 , R3, R4, R5, R 6 , R7, Rg, R9 and R 10 can form a ring between one another or between R n (one of R Rio) and either X or Y or both;
  • the pro-fluorophore (Pro-FL) useful in the practice of the present invention can be prepared from the fluorophore (FL *) by chemical conversions, known in the art, and as depicted in the general Scheme III, as shown below.
  • the said chromogen (CHR-gen) can be prepared from the chromophore (CHR *) by chemical conversions, known in the art, and as depicted in the general Scheme IV, shown below.
  • the pro-fluorophore can be an oxazine such as for instance:
  • Ri, R 2 , R 3 , R4, R5 and R 6 are hydrogen, halogen (F, CI, Br, I), nitro (N0 2 ), cyano (CN), carbonyl (CHO or C(O)R), C C 8 alkyl, C 3 -C 8 cycloalkyl or aryl.
  • R R 2 , R 3 , R 4 , R 5 and R 6 can also form an optionally substituted ring between one another or between R n and either X or Y, or both.
  • the pro-fluorophore can be a coumarin such as:
  • R l5 R 2 , R3, R4 and R5 are each independently, hydrogen, halogen (F, CI, Br, I), nitro (N0 2 ), cyano (CN), carbonyl (CHO or C(O)R), C C 8 alkyl, C 3 -C 8 cycloalkyl, or aryl; wherein each alkyl, aryl and acyl is optionally substituted with one to three substituents independently selected from halo, nitro (N0 2 ) and C 1 -C3 alkyl), alkylsulfonyl (RS0 2 -) and arylsulfonyl (ArS0 2 -), wherein the alkylsulfonyl and arylsulfonyl are each optionally substituted with one to three substituents independently selected from halo, nitro (N0 2 ) and Ci-C 3 alkyl.
  • the pro-fluorophore can be a compound of Formula IV, as shown below:
  • Ri, R 2 , R3, R4 and R5 are each independently, hydrogen, halogen (F, CI, Br, I), nitro (N0 2 ), cyano (CN), Ci-Cs alkyl, C3-C 8 cycloalkyl, or aryl, each alkyl, cycloalkyl and aryl being optionally substituted with one to three substituents independently selected from halo, nitro (N0 2 ), and C 1 -C 3 alkyl.
  • R l 5 R 2 , R3, R4 and R5 can also form a ring between any two of R l 5 R 2 , R3, R 4 and R5, or between any one of Ri, R 2 , R3, R 4 and R5 and the N of Formula IV; and wherein R is hydrogen, Ci-Cg alkyl, C 3 -C 8 cycloalkyl, arylalkyl (such as benzyl), or aryl wherein each of the Q-Cg alkyl, C 3 -C 8 cycloalkyl, arylalkyl and aryl are optionally substituted with one to six substituents independently selected from carboxyl (COOH), sulfonate (SO 3 H) and amino (NH 2 ).
  • X in Formula IV represents a counter-ion exemplified by but not limited to: chloride, bromide, iodide, tosylate, mesylate and perchlorate.
  • the pro-fluorophore can be a compound of Formula V, as shown below:
  • Ri, R 2 and R3 are hydrogen, halogen (F, CI, Br, I), nitro (N0 2 ), Ci-Cs alkyl, C 3 -C 8 cycloalkyl, or aryl, each independently optionally substituted with one to three halo, nitro (N0 2 ), C 1 -C 3 alkyl groups.
  • R l 5 R 2 and R 3 can also form a cyclic structure between any two of R l 5 R 2 and R 3 , or between any one of R l 5 R 2 and R 3 and N or Y of the heterocycle of formula V; and wherein R is hydrogen, or Ci-Cg alkyl, C 3 -C 8 cycloalkyl, arylalkyl (such as benzyl), or aryl, each alkyl, cycloalkyl and arylalkyl being independently optionally substituted. Suitable substituents include but are not limited to carboxyl (COOH), sulfonate (SO 3 H), and amino (NH 2 ) etc.
  • X represents a suitable counter-ion such as for instance, but not limited to: chloride, bromide, iodide, tosylate, mesylate and perchlorate.
  • Y is oxygen, nitrogen, sulfur, selenium or C(CH 3 ) 2 .
  • the pro-fluorophore can be any of the moieties A, Li, L 2 , L3, L 4 in Formula VI (below): Formula VI
  • the complex is formed from A, Li, L 2 , L 3 , L 4 in Formula VI with or without the assistance of a catalyst or activator as explained below.
  • the structure represented by Formula VI is a coordination compound such as, for instance, an organometallic compound, where A is a central ion which is chelated by ligands L l5 L 2 , L 3 , L 4 .
  • Central ion A and ligands L l5 L 2 , L 3 , L 4 are chosen in such a way that only the combination of A coordinated by ligands Li, L 2 , L 3 , L 4 will generate a discreet spectroscopic signal manifested by color or fluorescence, or both.
  • Li, L 2 , L 3 , L 4 can be any chemical moiety capable of forming coordination bonds with central ion A, via electron pairs available on a nitrogen, oxygen, sulfur or selenium atom of the ligand.
  • One category of the molecules useful in the present invention as a ligand incorporates a heterocyclic compound and derivatives thereof, which may include, but is not limited to a heterocycle selected from: furane, thiophene, pyrrole, oxazole, thiazole, imidazole, pyrazolidinyl, pyrazole, isoxazole, isothiazole, oxadiazole, triazole, thiadiazole, tetrazole, 2H-pyrane, 4H- pyrane, pyridine, bipyridyl, terpyridine, triazine, piperidine, pyrrolidine, 1,4-dioxane,
  • ligands L includes polydentate chelators and their derivatives, such as ethylenediaminetetraacetic acid (EDTA), l,2-bis(2-aminophenoxy)ethane-N,N,N',N'- tetraacetic acid (BAPTA), diethylenetriaminepentaacetic acid (DTPA), triethylenetetramine- N,N,N',N",N"',N"'-hexaacetic acid (TTHA), N,N,N ⁇ N'-tetrakis(2-pyridylmethyl)ethylene- diamine (TPEN), ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid (EGTA), l,4,7,10-tetraazacyclododecane-l,4,7,10-tetraacetic acid (DOTA), 1,4,8,11-tetraazacyclo- tetradecane-5,12-di
  • L includes but is not limited to ⁇ -diketones (e.g.
  • triphenylphosphine oxide w-trioctylphosphine oxide
  • aromatic acids and phenols and their derivatives e.g. tiron, catechol, salicylic acid
  • Schiff bases and their derivatives e.g. the 2- phenolsalicylimine depicted in Example 5 below.
  • Another class of ligands, L includes solvent molecules. This class is chemically very diverse, and includes several of the compounds mentioned above, such as heterocyclic compounds (pyridine, collidine, furan, tetrahydrofurane (THF) etc.) and crown ethers (15-crown- 5 etc.), as well as other molecules representing a broad selections of chemical functionalities. These include, for instance, the following molecules and their derivatives: water, alcohols (methanol, ethanol etc.), amines (triethylamine, diisopropylethylamine, morpholine,
  • dimethylamine dimethylamine, ⁇ , ⁇ -dimethylaminopyridine (DMAP) etc.), ethers (diethyl ether etc.), polar aprotic solvents (dimethyl sulfoxide (DMSO), dimethylformamide (DMF), dimethylacetamide (DMA), hexamethylphosphoramide (HMPA), l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (DMPU), l,3-dimethyl-2-imidazolidinone (DMI), l-methyl-2-pyrrolidinone (NMP), acetonitrile (AcCN), sulfolane, tetraethylene glycol dimethyl ether (tetraglyme), etc.).
  • DMSO dimethyl sulfoxide
  • DMF dimethylformamide
  • DMA dimethylacetamide
  • HMPA hexamethylphosphoramide
  • DMPU dimethyl-3,4,5,6-t
  • central ion A can be any positively charged ion capable of forming a coordination compound with one or more of the ligands, L.
  • One category of the ions, A useful in the practice of the present invention is the category of metal ions, including, but are not limited to, transition metal ions, alkaline and alkaline earth metal ions, lanthanides and actinides.
  • Central ion A can be provided in a form of an inorganic or organic salt.
  • Suitable inorganic salts include, but are not limited to mineral acid salts such as, sulfates, sulfites, sulfides, nitrates, nitrites, carbonates, borates, phosphates, selenates, fluorides, chlorides, bromides, iodides, chlorates, perchlorates, etc.
  • Suitable organic salts include, but are not limited to organic acid salts such as, monocarboxylic acid salts (e.g.
  • polycarboxylic acid salts e.g. salts of oxalic, malonic, succinic, glutaric, adipic, citric, trimesic, mellitic etc. acids.
  • Another class of central ion A includes oxygen atom-containing moieties such as hydroxides and oxides etc.
  • central ion A for any particular embodiment of the present invention is dictated by the application (i.e. the object or item to be marked and its environment) and the carrier properties (i.e. the nature of the medium that includes the marker, such as for instance a coating, a paint or a varnish layer).
  • the complex is formed from A, L l5 L 2 , L 3 , L 4 in Formula VI with the assistance of a catalyst or activator.
  • the catalysts and activators useful in the practice of the present invention include basic and nucleophilic agents, exemplified but not limited to, simple organic and inorganic bases (hydroxides, amines, alkoxides, phenoxides and the like). This category also comprises inorganic or organic salts of weak acids and strong bases generating upon solvolysis alkaline solutions, e.g. ammonium, alkaline and alkaline earth metal carbonates, bicarbonates, borates, phosphates, acetates etc.
  • hydroxides are alkaline and alkaline earth hydroxides such as ammonium, lithium, sodium, potassium, rubidium, cesium, calcium, strontium or barium hydroxide as well as tetraalkylammonium hydroxides, such as
  • amines useful as catalysts and activators include but are not limited to: triethylamine, diisopropylethylamine, benzylamine, morpholine, pyrrolidine, piperidine, dimethylaminoaniline etc.
  • alkoxides and phenoxides useful as catalysts and activators include but are not limited to:
  • alkaline alkoxides and phenoxides such as: sodium or potassium methoxide, ethoxide or phenoxide.
  • the catalyst is an acidic substance, as defined by either Br0nsted- Lowry or Lewis theory, and can be represented by simple organic or inorganic acid, as well as any inorganic or organic salt of weak base and strong acid generating acidic conditions upon solvolysis, e.g. metal chloride, bromide, nitrate, sulfate etc.
  • Compounds useful as developers, i.e. decrypting agents in the practice of the present invention include compounds known in the art as good chelators or complexing agents, such as for instance and without limitation:
  • Heterocyclic aromatic compounds e.g. imidazoles, phenanthrolines, pirydines, thiazoles and the derivatives thereof;
  • EDTA EDTA
  • EGTA EGTA
  • BAPTA DOTA, DTP A
  • ⁇ -diketones e.g. acetylacetone and the derivatives thereof, including but not limited to hexafluoroacetylacetone; 4,4,4-trifluoro-l -phenyl- 1,3-butanedione; l,3-diphenyl-l,3- propanedione);
  • Phosphine oxides trioctylphosphine oxide; triphenylphosphine oxide;
  • Aromatic acids and polyphenols e.g. salicylic acid, catechol, Tiron
  • Aromatic aldehydes e.g. 4-(N,N-dimethylamino)benzaldehyde, 4-(N,N- dimethylamino)cinnamaldehyde, p-anisaldehyde, 4-hydroxybenzaldehyde, etc.
  • Compounds useful as developers, i.e. decrypting agents in the practice of certain embodiments of the present invention include compounds known in the art as nucleophilic species, involved in solvolysis or deprotection, such as for instance, simple organic and inorganic bases (hydroxides, amines, alkoxides, phenoxides and the like); simple organic and inorganic salts (acetates, sulfides, iodides, fluorides, oxalates, citrates and the like).
  • Compounds useful as developers, i.e. decrypting agents in the practice of certain embodiments of the present invention also include compounds known in the art as acidic species, involved in solvolysis or deprotection such as simple organic and inorganic acids.
  • the developer can be an electrophilic species for solvolysis or deprotection, such as for instance, an aldehyde compound, e.g. benzaldehyde or salicyladehyde, or derivatives thereof.
  • the pro-fluorophore or chromogen can be used as the developer and any of the chemical compounds listed above can be used in the coating or embedded in the material marked.
  • the chromogen or pro-fluorophore can then be used as the developer.
  • the developer may require the presence of the catalyst to speed up the decryption reaction of the encrypted fluorophore (which may also be referred to as a pro-fluorophore) or the encrypted chromophore (which may also be referred to as a
  • prochromophore or a chromogen
  • the catalysts useful in the practice of the invention include for instance, basic and nucleophilic agents, exemplified but not limited to, simple organic and inorganic bases (hydroxides, amines, alkoxides, phenoxides and the like.
  • the catalysts can be a simple organic or inorganic acid.
  • Encrypted pro-fluorophores are hidden/occult fluorophores that are revealed by development with a specific reagent that converts the pro-fluorophore or leuco-form that may be colorless and shows little or no fluorescence to the active fluorophore which may also be intensely colored under visible light
  • the compound, rhodamine B hydrazide, a colorless compound can be developed with Cu 2+ metal ions under acidic conditions to yield a magenta compound with intense orange -red fluorescence. See the reaction illustrated above, showing the conversion of the colorless hydrazide to the magenta copper-coordinated compound by the copper ion, which in turn is slowly hydrolyzed to the colorless carboxylate.
  • the natural properties of susceptibility to a first order hydrolysis reaction can be used as a "time stamp" wherein the rate of decay in air or in a specific carrier under normal conditions is characteristic of the particular encrypted fluorophore.
  • the compound can be a leuco form chosen to be relatively stable in a liquid, such as an ink and decay over a period of weeks to produce a colored and intensely fluorescent form.
  • the two part fluorophores are assembled from two non-fluorescent, or very weakly fluorescent components (A) and (B), in some cases in the presence of a catalyst. Only upon reaction of both (A) and (B) components is the actual fluorophore produced. The reaction between both components may also generate colorimetric changes in addition to developing fluorescence. Component (A) of the two part fluorophore can be used as the hidden
  • security/authentication marker and the verification can be achieved by adding the second component (B) to component (A) to produce the active fluorophore.
  • this process may be enhanced by the addition of a catalyst.
  • substituted benzazolium salts can be used as the component (A) and developed with a specific reagent (and an optional catalyst) as exemplified below:
  • non-fluorescent components (A) are stable and only revealed by exposure to the appropriate second components (B) and do not spontaneously decrypt over time.
  • Alternative substituents of the aromatic compounds can be used to change the spectral properties or solubility profile of the fluorophore at the option of the chemist or the designer of the pro-fluorophore as a cryptic marker.
  • Inorganic elements can be used as thermostable or even fire resistant markers that can be revealed by development with a specific reagent, which can be an organic component.
  • a specific reagent which can be an organic component.
  • aluminum chloride (AICI 3 ) can be used as a covert marker that may be incorporated into for example an ink, a lacquer or a varnish and revealed by addition of a specific chelating agent which becomes intensely fluorescent by forming a coordination compound with new spectral properties.
  • a catalyst may be required to speed the reaction.
  • An example of the formation of an aluminum-based fluorophore from an aluminum chloride (AICI 3 ) marker is shown below:
  • thermostable pro-fluorophores include anions such as phosphate ions, iodide ions, fluoride ions and acetate ions; and cations such as metal ions.
  • Appropriate choice of alternative substituents of the aromatic coordination compounds or chemosensors can be used to change the spectral and other physicochemical properties of the fluorophore at the option of the designer.
  • Encrypted pro-fluorophores can be rendered polymerizable by addition of appropriate functional groups. Such encrypted pro-fluorophores can be based on excellent fluorophores (bright and with high quantum yields) that are readily and inexpensively synthesized. Pro- chromophores and pro-fluorophores with chromophoric and fluorescence emission properties can be provided, depending on the chromophore or fluorophore template chosen.
  • the chemical stability and hydrophobicity of the pro-fluorophores can be controlled by choice of the appropriate acyl groups or aromatic ring substituents.
  • the encrypted fluorophores can also be incorporated into
  • nanoparticles containing DNA such as for instance, and without limitation, lyophilized or encapsulated DNA.
  • Polymerization of the above exemplified polymerizable pro-fluorophore in a methyl-methacrylate polymer is shown below:
  • Such polymers can be used to encapsulate security markers, such as DNA or other biomolecules, or can be assembled as microparticles or nanoparticles for use as transferable markers, or for incorporation into polymers or other materials with or without entrapped DNA or other detectable marker(s).
  • security markers such as DNA or other biomolecules
  • microparticles or nanoparticles for use as transferable markers, or for incorporation into polymers or other materials with or without entrapped DNA or other detectable marker(s).
  • Rhodamine B (479 mg) was dissolved in ethanol and excess of 65% aqueous hydrazine was added to this mixture under vigorous stirring. After refluxing for 2 hours the reaction mixture was cooled and off-white precipitate was collected. The solid was extensively washed with ethanol : water mixture and the 2-amino-3',6'-bis(diethylamino)spiro[isoindoline-3,9'- xanthene]-l-one product was dried in vacuo.
  • Eosin Y (648 mg) was suspended in acetic anhydride and the mixture was stirred at reflux for 5 hours. Then the reaction mixture was slowly added to ice- water mixture. The resulting light brown solid was collected and washed with several portion of water. Then the product was dissolved in dimethylformamide (DMF) and precipitated by adding to water. After water wash the solid -acetoxy-2',4',5',7'-tetrabromo-3-oxo-spiro[isobenzofuran-l,9'-xanthene]-3'- yl) acetate product was dried in vacuo.
  • DMF dimethylformamide
  • Fluorescein sodium salt (376 mg) was suspended in methacrylic anhydride and the mixture was stirred at reflux for 5 hours. Then the reaction mixture was slowly added to ice- water mixture. Resulting light brown solid was collected and washed with several portion of water. Then the product was dissolved in dimethylformamide and precipitated by adding to water. After water wash the yellow solid 6'-(2-methylprop-2-enoyloxy)-3-oxo-spiro[isobenzofuran-l,9'-xanthene]- 3'-yl]2-methylprop-2-enoate product was dried in vacuo.

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  • Organic Chemistry (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
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PCT/US2015/021165 2014-03-18 2015-03-18 Encryped optical markers for security applications WO2015142990A1 (en)

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JP2017501090A JP2017512692A (ja) 2014-03-18 2015-03-18 セキュリティ用途のための暗号化された光学マーカー
CA2940655A CA2940655C (en) 2014-03-18 2015-03-18 Encrypted optical markers for security applications
CN201580014368.6A CN106103121B (zh) 2014-03-18 2015-03-18 用于安全应用的加密光学标记物
EP15765671.1A EP3119610B1 (de) 2014-03-18 2015-03-18 Verschlüsselte optische marker für sicherheitsanwendungen

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CN106103121A (zh) 2016-11-09
EP3119610A1 (de) 2017-01-25
US20150266332A1 (en) 2015-09-24
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CA2940655A1 (en) 2015-09-24
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